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W A T E R - S O U R C E H E A T P U M P S
JRE - Series
R e v . : A u g u s t 1 9 , 2 0 2 0
Water Quality Standards
Table 1: Water Quality Standards
Water Quality
Parameter
Scaling Potential - Primary Measurement
Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below
pH/Calcium Hardness
Method
Index Limits for Probable Scaling Situations -
Scaling indexes should be calculated at 66°C for direct use and HWG applications, and at 32°C for indirect HX use.
A monitoring plan should be implemented.
Ryznar
Stability Index
Langelier
Saturation Index
Iron Fouling
Iron Fe
(Ferrous)
2+
(Bacterial Iron potential)
Iron Fouling
Corrosion Prevention
pH
Hydrogen Sulfide (H
S)
2
Ammonia ion as hydroxide, chloride,
nitrate and sulfate compounds
Maximum
Chloride Levels
Erosion and Clogging
Particulate Size and
Erosion
The Johnson Controls Water Quality Table provides water quality requirements for Johnson Controls coaxial heat exchangers. The water should be evaluated by an independent testing
facility comparing to this Table and when properties are outside of these requirements, an external secondary heat exchanger must be used to isolate the heat pump heat exchanger
from the unsuitable water. Failure to do so will void the warranty for the coaxial heat exchanger and any other components damaged by a leak.
Notes:
• Closed Recirculating system is identified by a closed pressurized piping system.
• Recirculating open wells should observe the open recirculating design considerations.
• NR - Application not recommended.
• "-" No design Maximum.
14
HX
Closed
Material
Recirculating
-
All
(Operation outside these limits is not recommended)
-
All
-
All
-
All
-
All
6 - 8.5
All
Monitor/treat as
needed
-
All
-
All
Copper
-
-
Cupronickel
304 S S
-
316 SS
-
Titanium
-
<10 ppm of particles
and a maximum
velocity of 1.8 m/s
All
Filtered for maximum
841 micron [0.84 mm,
20 mesh] size.
I n s t a l l a t i o n , O p e r a t i o n , M a i n t e n a n c e
Open Loop and Recirculating Well
pH < 7.5 and Ca Hardness <100ppm
6.0 - 7.5
If >7.5 minimize steel pipe use.
-0.5 to +0.5
If <-0.5 minimize steel pipe use. Based upon 66°C HWG and
Direct well, 29°C Indirect Well HX
<0.2 ppm (Ferrous)
If Fe
(ferrous)>0.2 ppm with pH 6 - 8, O2<5 ppm check for iron bacteria.
2+
<0.5 ppm of Oxygen
Above this level deposition will occur .
Minimize steel pipe below 7 and no open tanks with pH <8
<0.5 ppm
At H
S>0.2 ppm, avoid use of copper and copper nickel piping or HX's.
2
Rotten egg smell appears at 0.5 ppm level.
Copper alloy (bronze or brass) cast components are OK to <0.5 ppm.
<0.5 ppm
Maximum Allowable at maximum water temperature.
10°C
24°C
<20ppm
<150 ppm
<400 ppm
<250 ppm
<1000 ppm
<550 ppm
>1000 ppm
>550 ppm
<10 ppm (<1 ppm "sandfree" for reinjection) of particles and a maximum
velocity of 1.8 m/s. Filtered for maximum 841 micron 0.84 mm,
20 mesh] size. Any particulate that is not removed can potentially
clog components.
6 - 8.5
38 C
NR
NR
NR
NR
<150 ppm
< 375 ppm
>375 ppm
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